/usr/include/Poco/Crypto/ECDSADigestEngine.h is in libpoco-dev 1.8.0.1-1ubuntu4.
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// ECDSADigestEngine.h
//
//
// Library: Crypto
// Package: ECDSA
// Module: ECDSADigestEngine
//
// Definition of the ECDSADigestEngine class.
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Crypto_ECDSADigestEngine_INCLUDED
#define Crypto_ECDSADigestEngine_INCLUDED
#include "Poco/Crypto/Crypto.h"
#include "Poco/Crypto/ECKey.h"
#include "Poco/DigestEngine.h"
#include "Poco/Crypto/DigestEngine.h"
#include <istream>
#include <ostream>
namespace Poco {
namespace Crypto {
class Crypto_API ECDSADigestEngine: public Poco::DigestEngine
/// This class implements a Poco::DigestEngine that can be
/// used to compute a secure digital signature.
///
/// First another Poco::Crypto::DigestEngine is created and
/// used to compute a cryptographic hash of the data to be
/// signed. Then, the hash value is encrypted, using
/// the ECDSA private key.
///
/// To verify a signature, pass it to the verify()
/// member function. It will decrypt the signature
/// using the ECDSA public key and compare the resulting
/// hash with the actual hash of the data.
{
public:
ECDSADigestEngine(const ECKey& key, const std::string &name);
/// Creates the ECDSADigestEngine with the given ECDSA key,
/// using the hash algorithm with the given name
/// (e.g., "SHA1", "SHA256", "SHA512", etc.).
/// See the OpenSSL documentation for a list of supported digest algorithms.
///
/// Throws a Poco::NotFoundException if no algorithm with the given name exists.
~ECDSADigestEngine();
/// Destroys the ECDSADigestEngine.
std::size_t digestLength() const;
/// Returns the length of the digest in bytes.
void reset();
/// Resets the engine so that a new
/// digest can be computed.
const DigestEngine::Digest& digest();
/// Finishes the computation of the digest
/// (the first time it's called) and
/// returns the message digest.
///
/// Can be called multiple times.
const DigestEngine::Digest& signature();
/// Signs the digest using the ECDSADSA algorithm
/// and the private key (the first time it's
/// called) and returns the result.
///
/// Can be called multiple times.
bool verify(const DigestEngine::Digest& signature);
/// Verifies the data against the signature.
///
/// Returns true if the signature can be verified, false otherwise.
protected:
void updateImpl(const void* data, std::size_t length);
private:
ECKey _key;
Poco::Crypto::DigestEngine _engine;
Poco::DigestEngine::Digest _digest;
Poco::DigestEngine::Digest _signature;
};
} } // namespace Poco::Crypto
#endif // Crypto_ECDSADigestEngine_INCLUDED
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